* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html,
body {
    width: 100%;
    height: 100%;
}

div {
    width: 500px;
    height: 500px;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    margin: auto;
    transform-style: preserve-3d;
    border: solid 1px;
}

img.f1 {
    width: 100px;
    position: absolute;
    top: 200px;
    left: 200px;
    animation: f1 2s infinite;
}

img.f2 {
    width: 100px;
    position: absolute;
    top: 200px;
    left: 200px;
    animation: f2 2s ease 0.5s infinite normal backwards;
}

img.f3 {
    width: 100px;
    position: absolute;
    top: 200px;
    left: 200px;
    animation: f3 2s linear 1s infinite normal backwards;
}

@keyframes f1 {
    from {
        transform: scale(1);
        opacity: 100;
    }


    to {
        transform: scale(4);
        opacity: 0;
    }
}

@keyframes f2 {
    from {
        transform: scale(1);
        opacity: 100;
    }


    to {
        transform: scale(4);
        opacity: 0;
    }
}

@keyframes f3 {
    from {
        transform: scale(1);
        opacity: 100;
    }


    to {
        transform: scale(4);
        opacity: 0;
    }
}